Unknown BIOS Error=FFFF. What is this?

Unknown BIOS Error=FFFF. What is this?

Upon reviewing your problem, I notice that you have already done some troubleshooting yourself. Great job on that. If I also got it correctly, the system still boots up and loads the operating system. You are probably getting some message that says press f2 to continue or none at all, but in any case, the system still go straight to windows and you only keep on getting this error message during start up. If all my assumptions are correct, then most probably this will not be as hard to fix and hopefully by in a few very simple steps this problem will be resolved.

Since you have already tried loading the default settings in the BIOS. My first advise is to reset the extended system configuration data in the bios. Go to the system BIOS and look for it under PNP/PCI configuration. Set Reset Configuration Data to enable. The ESCD contains information about non-plug and play devices and the configuration of the system the last time it was booted. You mentioned you replaced your power supply so this may help.

With regards to your question regarding bios updates, you can update your bios is there is an available update and recommended update from the motherboard manufacturer. The thing is, most bios update comes with a disclaimer that if you do not do it properly, it may harm your system.

The CMOS memory or sometimes called NVRAM (which stands for non-volatile random access memory) basically remembers system configuration even after you switch it off. It is powered by a small battery in your motherboard that can be sometimes easily replaced if there is a battery failure. However in your case I don’t see any problem with the CMOS battery yet since your system seems to be still remembering the old setting or configuration.

Try this as well. Unplug the power chord from the back of the tower. Press the power button for a few seconds. Plug the power chord back. Then turn on your computer. This is not essential but might somehow help. We just need to make sure to cycle down the power or any residual electrical charges are completely out of the system. A simple trick sometimes helps.

If clearing the ESCD would not work, another potential solution to the problem is by clearing the NVRAM using the jumper method. Basically there is a jumper (miniscule, very tiny) in most motherboard that you can access to drain the CMOS memory by draining the power. There are 3 small pins, but the two pins by default are connected by a rubber/plastic jumper. So if it is currently connecting the first two pins, remove the jumper and connect the second and third pin. Give it a minute or so, then replace the jumper back to its original position. Consult motherboard specification for more details and the location of the jumper if any.

Hopefully all these will help fix the problem.